Startseite First-Principles Investigations on Structural, Elastic, Dynamical, and Thermal Properties of Earth-Abundant Nitride Semiconductor CaZn2N2 under Pressure
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First-Principles Investigations on Structural, Elastic, Dynamical, and Thermal Properties of Earth-Abundant Nitride Semiconductor CaZn2N2 under Pressure

  • Ying-Qin Zhao , Cui-E. Hu , Lei Liu ORCID logo , Yan Cheng EMAIL logo und Ling-Cang Cai
Veröffentlicht/Copyright: 10. November 2016

Abstract

We presented a detailed first-principal calculation to study the structural, elastic, dynamical, and thermal properties of a new synthetic ternary zinc nitride semiconductors CaZn2N2 using the generalised gradient approximation (GGA) method. The obtained lattice parameters of CaZn2N2 at 0 K and 0 GPa are in good agreement with the experimental data and other theoretical findings. The pressure dependences of the elastic constants Cij together with other derived mechanical properties of CaZn2N2 compound have also been systematically investigated. The results reveal that CaZn2N2 is mechanically stable up to 20 GPa. The calculated the phonon curves and phonon density of states under different pressures indicate that the CaZn2N2 compound maintains its dynamical stability up to 20 GPa. An analysis in terms of the irreducible representations of group theory obtained the optical vibration modes of this system, and we obtained the frequencies of the optical vibrational modes at Г points together with the atoms that contributed to these vibrations of CaZn2N2. Meanwhile, the pressure dependencies of the frequencies Raman-active and IR-active modes at 0–20 GPa have been studied. The quasi-harmonic approximation (QHA) was applied to calculate the thermal properties of CaZn2N2 as functions of pressures and temperatures such as the heat capacity, thermal expansions, the entropy, and Grüneisen parameter γ.

Acknowledgements

The authors would like to thank the supports by the NSAF (Grant Nos. U1430117, U1230201). We also acknowledge the support for the computational resources by the State Key Laboratory of Polymer Materials Engineering of China in Sichuan University. Some calculations are performed on the ScGrid of Supercomputing Center, Computer Network Information Center of Chinese Academy of Sciences.

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Received: 2016-8-25
Accepted: 2016-10-11
Published Online: 2016-11-10
Published in Print: 2017-1-1

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